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Hierarchical structure based wireless sensor network time synchronization method

A wireless sensor and hierarchical structure technology, applied in the direction of synchronization device, network topology, wireless communication, etc., can solve the problems of high message exchange overhead, increased algorithm complexity, synchronization error growth, etc., to reduce energy consumption and enhance scalability , reduce the effect of message interaction

Inactive Publication Date: 2014-07-23
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, the TPSN algorithm has the following disadvantages: (1) the message exchange overhead is too large; (2) the synchronization error grows freely between two adjacent synchronization operations; (3) when a new node joins the network, it is necessary to initialize the hierarchical nodes, increasing Algorithmic complexity

Method used

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  • Hierarchical structure based wireless sensor network time synchronization method
  • Hierarchical structure based wireless sensor network time synchronization method
  • Hierarchical structure based wireless sensor network time synchronization method

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] The wireless sensor network of the present invention is made up of three parts: gateway node, sink node S1, S2, ..., SL, sensor node N1, N2, ..., NN, such as figure 1 shown.

[0025] There are three types of nodes in wireless sensor networks: gateway nodes, which provide a time reference for time synchronization, have stronger transmission power than sensor nodes, and have functions such as data collection, calculation, and data fusion, and provide active power supply; The time-synchronized bridge has the ability to forward broadcast data packets, and can directly communicate with the gateway node to supply power for the active source; the sensor node has the function of data collection, and only performs information interaction of the sensing data, and realizes the time of the node by listening Synchronize, power the battery.

[0026] This embodiment takes dep...

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Abstract

The invention provides a hierarchical structure based wireless sensor network time synchronization method. According to the hierarchical structure based wireless sensor network time synchronization method, gateway nodes and aggregation nodes are distributed in a monitoring site in advance and sensor nodes are carried by operators; the gateway nodes send hierarchy establishment broadcast data packages with time stamps; the aggregation nodes and the sensor nodes within the communication distance range extract hierarchy information after receiving the data packages, hierarchies of the aggregation nodes and the sensor nodes are changed by adding one to the current hierarchies, and local clocks are modified according to the time stamps; the gateway nodes are served as global time after network hierarchies are built, the timed polling sends time synchronization data packages to aggregation sub-nodes and the aggregation nodes synchronize the local clock time and the global time through the time synchronization algorithm; the sensor nodes perform time synchronization on the local clocks by intercepting time synchronization mutual data package information. The hierarchical structure based wireless sensor network time synchronization method achieves high accuracy time synchronization and improves the wireless sensor network channel utilization rate and the network life cycle.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and in particular relates to a high-precision wireless sensor network time synchronization method. Background technique [0002] The sensor network is a task-oriented network composed of distributed sensor nodes. It detects physical information such as temperature, humidity, sound, pressure, and speed of the detection target in the network distribution area in a cooperative manner, and transmits the information to the monitoring center in a self-organizing manner. Realize real-time monitoring of the target area. It has important research and application value in many fields such as industrial and agricultural control, urban management, and urban security. For example, in power substation operation and maintenance operations, the target personnel carry sensor nodes, and use the arrival time difference of ultrasonic signals to locate the specific location of the target personnel, ...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18H04J3/06
Inventor 沈海平马娜诸军姜华吴曦
Owner STATE GRID CORP OF CHINA
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